Amana Washer Stuck on Sensing Light: Troubleshooting and... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) controls the washer's operation. During the sensing phase, the MCU monitors the pressure switch, water level, and motor feedback to determine the load size and adjust water levels and wash times. If the MCU detects an anomaly (e.g., incorrect pressure switch reading, motor not responding), it will remain in the sensing phase.

Symptoms:

The Amana washing machine powers on, fills with water, and then the sensing light remains illuminated for an extended period (30 minutes or more) without advancing to the next cycle. The washer does not agitate or spin.

Possible Causes:

Obstruction in the drain pump or drain hose
Faulty pressure switch
Defective water inlet valve
Malfunctioning motor control unit (MCU)
Load imbalance
Clogged air dome or pressure hose

Solution:

1

Unplug the washer from the 120V AC outlet.
2

Check the drain hose for kinks or obstructions. Remove the hose and flush with water.
3

Inspect the drain pump for debris. Remove any obstructions.
4

Access the pressure switch (usually near the bottom of the tub). Disconnect the hose and blow through it to check for blockages. Use a multimeter to test the switch for continuity in the filled and empty states.
5

Test the water inlet valve coils with a multimeter. Resistance should be between 500-1500 ohms. If open or shorted, replace the valve.
6

Check the wiring harness for any loose or damaged connections.
7

If all other components check out, suspect a faulty MCU. Replacement may be necessary.

Safety Warning:

Disconnect power to the appliance before attempting any repairs. Electrical shock hazard exists when working with electrical components. Follow Lock-Out/Tag-Out (LOTO) procedures to ensure the appliance remains de-energized during repairs.

Prevention:

Periodically clean the drain pump filter (if accessible). Avoid overloading the washer. Use HE (High Efficiency) detergent to minimize suds and residue buildup. Run a washer cleaning cycle monthly with a washing machine cleaner.

Expert Tip:

Many Amana washers have a diagnostic mode. Press and hold the Start/Pause button for 3 seconds, then rotate the cycle selector knob one click clockwise, then one click counter-clockwise, and then one click clockwise. The error code will flash on the display.

Frequently Asked Questions

•What resistance should I expect from a working pressure switch?

A working pressure switch should have continuity (close to 0 ohms) in the empty state and open circuit (infinite ohms) in the filled state, or vice versa depending on the specific switch configuration. Consult the wiring diagram.

•How do I access the drain pump on this Amana washer model?

Typically, the drain pump is accessed from the front of the washer. Unplug the washer. Remove the lower access panel (usually held in place by screws or clips). The drain pump will be visible. Disconnect the hoses and electrical connector before removing the pump. Have a pan ready to catch any residual water.

•Where is the MCU located in this Amana washer?

The MCU is typically located behind the control panel, either at the top rear of the washer or behind the front panel. You'll need to remove the control panel to access it. Be careful when disconnecting the wiring harnesses from the MCU.

Amana Washer Stuck on Sensing Light: Troubleshooting and Bypass Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What resistance should I expect from a working pressure switch?

•How do I access the drain pump on this Amana washer model?

•Where is the MCU located in this Amana washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: